Fix travis config
Fix travis config

jl9n/phpwkhtmltopdf,ProPheT777/phpwkhtmltopdf,hongtoushizi/phpwkhtmltopdf,serjee/phpwkhtmltopdf,ProPheT777/phpwkhtmltopdf,jl9n/phpwkhtmltopdf,serjee/phpwkhtmltopdf,mikehaertl/phpwkhtmltopdf,mikehaertl/phpwkhtmltopdf,hongtoushizi/phpwkhtmltopdf